Op!

Op! +/- is a fun mobile app designed by a remedial teacher! This app allows children to learn their addition and subtraction tables through play, while introducing concepts such as commutativity (3 + 1 = 1 + 3) and missing terms (12 - ? = 4). A gentle progression of difficulty within each table helps children advance without even realizing it! Op! +/- is especially useful to support school learning, presenting the tables one by one; consistent with classroom teaching. Description of the educati